Whenever Sapling of Colfenor attacks, reveal the top card of your library. If it's a creature card, you gain life equal to that card's toughness, lose life equal to its power, then put it into your hand.
Sapling of Colfenor is an indestructible 4/4 attacker that turns combat into card advantage and life manipulation, pulling creatures off the top of your library when it connects (or even just attacks). You build a creature-dense deck, swing each turn to refill your hand, and leverage the life swings to fuel payoffs while grinding opponents out. Win through value-driven creature beatdown, recursion engines, or life-total combos.
Indestructible commander that's hard to remove and reliably attacks every turn
Generates repeatable card advantage on attack with no combat-damage requirement
Life gain plus life loss enables both lifegain and life-payment synergies
Black-green gives access to elite ramp, tutors, and recursion
Triggers only on attack, so it's vulnerable to fog, tapping, and stax that stop attacking
Life loss equal to power can be dangerous with high-power top decks
Card advantage is random unless you stack the top of your library
Indestructible doesn't stop exile, -X/-X, or sacrifice removal
Cheap instant-speed way to set the top card before combat for guaranteed value.
Add top-of-library control like Sensei's Divining Top, Brainstorm effects, and tutors (Vampiric, Worldly, Survival of the Fittest) to make the attack trigger deterministic. Layer in fast mana and recursion (Reanimate, Eternal Witness) to rebuild after wraths, and include evasion or anthem enablers so Sapling reliably keeps swinging. For higher power, build toward a tight Aetherflux or aristocrats combo line rather than pure goodstuff.